I don't think it's said enough that obsession with "securing" the Mexican border is basically insane, and not just because it's impossible. Sure people do cross the border illegally, but anti-immigrant activists obsessed with this really must live in some alternative universe. We let people in from all over the world all the time. Some need visas, many don't. Some are coming to be students. Some are coming to be temporary workers. Some are here for business travel. Some are tourists. And all of them can, if they want, easily overstay their visas or allowed time in the country.
